This bill proposes an amendment to the Patient Protection and Affordable Care Act (ACA) to prevent duplicate enrollments in health insurance Exchanges. Its core purpose is to ensure that individuals are not simultaneously enrolled in multiple Exchange plans, which can lead to improper federal subsidies. The legislation mandates that, within 60 days of enactment, the Secretary must establish a process to identify individuals with identical Social Security numbers enrolled in different Exchanges for the same coverage period. If such duplicate enrollments are detected, the Secretary is required to take necessary actions. These actions are specifically aimed at preventing the issuance of duplicative advance payments of premium tax credits for the same individual, thereby enhancing the integrity of the ACA marketplace.